Don't play with this. Go to a reputable seal company and ask for their support and I do recommend the 285 seal for this application. It's cost is high when compared to a local workshop but it's reliability will out weigh the cost and a local workshop does not understand mechanical seals in detail.
It sounds like you have reverse pressure issues. In order to establish the root cause you should include a P&ID of your system. How do you top up the system? You shouldn't need plan 11 with 53. Why do you have plan 11?
Can you attached a seal drawing as well? I may be able to give you some...
first of all barrier pressure must always be on before pressurising the vessel at all times. if you had reverse pressure you will most likely see product contamination in the barrier fluid. i dont see why the product crystalizes if its in the vessel, perhaps the product crytalizes or...
Humaidq
Max leakage in the event of failure needs to define the mode of failure. Looking at the drawing there are no pressures shown but if we assume flow through a 1/2" pipe with 1/8" orifice and 20PSI Delta P then leakage is around 1.5Gal/min. orifice area represents the bush clearance but...
plan 53A is a dual pressurised seal. Are you pressurising the barrier? what are the units for pressure? what is the shaft size? it looks like you can just run Plan 53A with water and it should just need topping up once per month so you do not need water near the plan 53A vessel, use a...
This depends on the application. what is the duty? normally set at low pressure to alarm when seal leaks and you can also set a HH trip. Send in the data sheet and you may get a good response
you cannot calculate this. rather strange set up, you have a fixed and a floating bush? normal seal leakage is approx 5-10cc/hr. are you injecting N2 where the green arrows are? normally there is only 1 bush and this appears to be for safety because the product is not environmentally safe...
first of all when you say operating pressure do you mean the vessel pressure or barrier fluid pressure? i will assume the vessel pressure, if that is the case then you need to pressurise the seal at approx 45 -47 Kg/cm2. why are you using silicon vs silicon carbide? sounds like the seal face...
I do not have the actual data sheets, in essence we are sealing cold services and wish to establish what to use to lubricate the orings. Do you have any experience?
Need some advice on what to use to lubricate orings on an ethylene service at minus 160C. I was considering a smear of silicon oil, does anyone have experience in this field.
I know if silicon grease is used it turns into powder and can cause problems.
Thank you in advance.
You can use special materials such as Hastelloy C to combat that.
Without more data it's difficult to advise however if you have such a product you may need dual seals!
External spring designs are a very good design and not necessarily pressurised internally. Slurry seals use external springs, some API seals are external design with standard OD Balance. They are used on high viscous or abrasive application. As the seal slides the dynamic oring slides on a clean...
David
In using a single seal, any leakage will drip into the drain cavity to atmosphere. In this arrangement the leakage detection vessel/container need not be designed as a pressure vessel. A simple pot with a level switch or transmitter will suffice. The issues I see is that if you want to...
Not sure which pumps you are manufacturing but all the pumps I have worked on have always used ORings. On the other hand ORings are readily available and they work well. I do not know what sq section availability is but my advice is to stick with std BS orings.
Cheers
For the gland plate you can apply e8 H8 tolerance to achieve a spigot fit (registered fit)
Check this and you will see the numbers.
E8H8 is found in a limits and fits book!
Good luck.
